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INVENTOR' I ATTORNEY 'J. D. MAWHOOD.

(No- Model.)

ROLLER MILL.

No. 373,241. Patented NQV. 15, 1887.

' WITNESSES.-

N PETERS. PMlo'Lflhognphnr. Washington, EC.

UNITED STATES PATENT OFFICE.

JONATHAN D. MAWHOOD, OF RICHMOND, INDIANA, ASSIGNOR TO THE RICHMOND CITY MILL WORKS, OF SAME PLACE.

ROLLER-M ILL.

SPECIFICATION forming part of Letters Patent No 373,291, dated November 15, 1887.

, Application filed April 4, 1887. Serial No. 233.573. (No model.)

To all whom it may concern.-

Be it known that I, JONATHAN D. MAW- HOOD, of Richmond, Wayne county, Indiana, haveinvented certain new and useful Improvements in Roller-Mills, of which the following is a specification.

This invention pertains to double rollermills-that is, roller-mills employing two pairs of rolls, the two rolls of each pair revolving toward each other at differentperipheral rates of speed.

My improvements have reference to the mechanism for giving motion to the-rolls. In the following specification I may often designate the slow-running rolls as the slow rolls, and details of mechanism peculiarly pertinent to those rolls as slow details, and the fast rolls and their peculiarly pertinent details may be designated in an appropriate corresponding manner.

My improvements will be readily understood from the following description, taken in connection with the accompanying drawings, in which- V Figure 1 is an elevation of one side of the main portions of a roller-mill embodying my improvements; Fig. 2, an elevation of the op posite side of the niill,and Fig. 3 a rear elevation of the mill with a portion of the frame broken away.

In the drawings, A indicates the usual frame of a roller-mill; B, the rear face thereof; 0, the fast rolls; D, the slow rolls; E, pulleys fast on both ends of the shafts of both fast rolls, the two pulleys at each single side of the mill coming in the same plane with each other, so as to be engaged by onebelt; F, pulleys fast on both ends of the shafts of both slow rolls, the two pulleys ateach single side of the mill coming in the same plane with each other, so as to be engaged by one belt, the pulleys F and the pulleys E upon each single side of the mill being arranged in separate planes, so as not to interfere with each other, as clearly seen in Fig. 3; G, pivot-supports supported by the mill-frame at each side some distance below the rolls; H, idle-shaft arms supported by these pivot-supports and capable of oscillating or being partially rotated with reference thereto; J, the pivots supported by the pivot-supports,

and engaged by the idle shaft arms; K, idleshafts projecting out sidewise from the idleshaft arms; L. a pulley upon each idle-shaft, said pulleys being in the same plane with the pulleys F;M, pulleys upon the idle-shafts in the same plane with pulleys E; N, adjustingscrews to serve in elfecting the angular adj ustment of theidle-shaft arms; 0. two belts, herein designatedas the fast belt,one at each side of the mill, each of these belts engaging the pulleys E and M upon its appropriate side ofthe mill, these belts also to engage pulleys upon a driving-shaft below the mill, (not shown in the drawings;) P, two tightening-pulleys,one at each side of the mill, these pulleys being in the same plane with the pulleys F and L; Q. twobelts, herein designated the slow belts, one at each side of the mill, each of these belts engaging the pulleys F, L, and P upon its ap propriate side of the mill, as clearly shown in in the drawings; R, adjusting screws, one at each side of the mill, to serve in effecting the adjustment of the tightening-pulleys P, and S pivoted arms serving as the adjustable rocking supports for the tightening-pulleys.

- The two pivots J may be independentof each other at each side of the mill-frame, or, if desired, they may be formed of a single pivotshaft extending clear across the mill-frame, as indicated by dotted lines at T in Fig. 3.

The idle-shafts K may be independent short shafts at each side of the mill, or they may be formed of a single shaft extending across through the mill-frame, as indicated by dotted lines at U in Fig. 3.

The pulleys L and M may be made fast to the idle-shafts and the shafts may be free to revolve in their supports, or these pulleys may be free to revolve on the shafts; but in either case the two pulleys L and M at each single side of the mill must be so connected with each other that they will revolve together.

By inspecting Figs. 1 and 2 it will be seen that the idle-shafts K in being adjusted by the screws N riseand fall in a path substantially parallel to the two leaves of the fast belts O, which engage the pulleys M. It will therefore be obvious that the raising and lowering of the idle-shafts will tend to loosen or tighten the fast belts. It will also be seen that the path ICC through which the idle-shafts move is substantially at right angles to the two leaves of the slow belts Q, which engage the pulleys L. It will therefore be obvious that as the idleshafls are raised and lowered the tension of the slow belts Q is not altered. It is thus seen that the raising and lowering of the idle-shafts may be utilized in altering the tension of the last belts without interfering with or being interfered with by the slow belts. It is also obvious that the slow belts may have their tension altered by the proper adjustment of the tighteningpulleys B without interfering with or being interfered with by the fast belts. It should also be obvious that the strains exerted upon the belts will be identical at each side of the mill, thus causing a uniform working action at each end of the rolls.

I have filed another application bearing the Serial No. 233,571. Vhalever is claimed in said application is hereby diselaimed, so far as the present application is concerned.

I claim as my invention 1. A roller-mill comprising a frame, two pairs-of rolls, each having a fast roll and a. slow roll, a pulley upon the same end of each fast roll, a pulley upon the same end of each slow roll, an idle-shaft below the rolls, two pulleys on such idleshaft in the same plane, respectively, with the pulleys on the slow and fast rolls, a tightening-pulley between said idlesha'ft and the rolls and in the same plane with the pulleys on the slow rolls, a belt engaging the pulleys on the slow rolls, said tightening-pulley, and one of said pulleys on the idle-shaft, and a belt engaging the other of said pulleys on the idle-shaft and the two pulleys on the fast rolls, and an adjustable support for the idle-shaft arranged to move said idle-shaft in a path substantiallyparallel with engaging portions of one of said belts, and substantially at right angles with the engaging portions of the other belt, combined and arranged for operation substantially as and for the purpose set forth.

2. Aroller-mill comprisiugaframe, two fast rolls, a pulley at each end of said fast rolls, two slow rolls, a pulley at each end of said slow rolls, idle-shafts supporting two pulleys at each side of the mill in the same plane, respectively, with the pulleys on the fast and slow rolls, a tightening-pulley at each side of the mill in the same plane with the pulleys on the slow rolls, belts at each side of the mill engaging the slow roll pulleys, the tighteningpulleys, and the appropriate ones of the idle shaft pulleys, belts at each side of the mill engaging the fast-roll pulleys and the appropriate ones of the idle-shaft pulleys, and means, substantially as described, for adjusting the idle-shafts in a path substantially parallel to the engaging portions of two of said belts, and substantially at right angles to the engaging portion of the other belts, combined and arranged for operation substantially as and for the purpose set forth.

JONATHAN D. MAWVHOOD.

Vitnesses:

S. E. SWAYNE, L. T. KEMON. 

